A: An Open In the In-Car Temperature Sensor Circuit

1. Remove the in-car temperature sensor.




2. Measure the resistance between the No.1 and No.2 terminals of the in-car temperature sensor.
*Check for change in resistance by heating or cooling the sensor with a hair drier.

* Is the resistance within the specifications shown on the graph?

YES-Go to step 3.

NO Replace the in-car temperature sensor.

3. Disconnect the climate control unit 20P connector.




4. Check for continuity between the No.16 terminal of the climate control unit 20P connector and the No. 2 terminal of the in-car temperature sensor 2P connector.

Is there continuity?

YES-Go to step 5.

NO-Repair open in the wire between the climate control unit and the in-car temperature sensor.




5. Check for continuity between the No.11 terminal of the climate control unit 20P connector and the No.1 terminal of the in-car temperature sensor 2P connector.

Is there continuity?

YES-Check for loose wires or poor connections at the climate control unit 20P connector and at the in-cur temperature sensor 2P connector. If the connections are good, substitute a known-good climate control unit, and recheck. If the symptom indication goes away, replace the original climate control unit.

NO-Repair open in the wire between the climate control unit and the in-car temperature sensor.